Ukpabi, Ndubuisi; Seidenkrantz, Marit-Solveig (2026): Depth‑resolved CHI hydrographic states and trend dynamics for core DA12‑11/2‑ST1‑GC01 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996254 (DOI registration in progress), In: Ukpabi, N; Seidenkrantz, M-S (2026): High resolution Holocene coccolithophore assemblages, absolute abundances, and hydrographic index (CHI) calculations from sediment core DA12 11/2 ST1 GC01, Iceland Basin [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.996263
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Published: 2026-07-31
Abstract:
This dataset summarizes the classified hydrographic states, percentile thresholds, and trend behaviors derived from CHI_sx (state index) and CHI z scores across the DA12 11/2 ST1 GC01 Holocene sequence. Each depth interval is assigned to a hydrographic state class (Low, Normal, or High), a percentile category (including Q10 and Q90 extremes), and a trend designation reflecting warming, cooling, or alternating/neutral conditions based on rolling slope analysis. These classifications are paired with species level coccolithophore percentages and ecozone assignments, enabling interpretation of ecological community structure within its hydrographic context. The table provides a categorical, decision ready framework for identifying hydrographic anomalies, transitions between Atlantic dominated and Polar influenced surface waters, and intervals of ecological stability or directional change. By combining state, trend, and ecozone information, this table offers a synthesized view of Holocene surface water dynamics that complements the quantitative CHI metrics and supports high resolution paleoenvironmental reconstruction.
Keyword(s):
Related to:
Ukpabi, Ndubuisi; Seidenkrantz, Marit-Solveig (in press): Holocene hydrography of the Iceland Basin from coccolith ecological contrasts: A multi‑axis index for salinity and stratification. Marine Micropaleontology
Coverage:
Latitude: 61.608930 * Longitude: -20.702730
Date/Time Start: 2025-09-12T14:20:00 * Date/Time End: 2025-09-12T14:20:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 4.180 m
Event(s):
DA12-11/2-GC01 (G1) * Latitude: 61.608930 * Longitude: -20.702730 * Date/Time: 2025-09-12T14:20:00 * Elevation: -2120.0 m * Location: Iceland Basin * Campaign: Dana12-11 * Basis: Dana (1981) * Method/Device: Gravity corer (GC)
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1600 data points